speaker noise

Klein36

the video pretty much explains what the problem is. it has not done this before. the only change i have made is radio rebroadcast through the UTMD. but i don't see a relationship between that and my slimlighter. it happens with only the LEDs (not lightbar or HAWs) and with the radio rebroadcast on and off. doesn't matter. ideas?

futurecop

Ive heard the same thing on several vehicles, including my own

rwo978

My 80K used to make wierd noises when just turned on (standby) with nothing else on (no lights). Must be a Unitrol thing.

dshannon

could this be alternator noise? I get it through my FM radio because of where I ran my wiring for my subwoofers, right next to my antenna. Just something to think about. If this is the case the noise would increase in speed with your engine speed.

Klein36

[quote:68e7d2d01d=\"dshannon\"]could this be alternator noise? I get it through my FM radio because of where I ran my wiring for my subwoofers, right next to my antenna. Just something to think about. If this is the case the noise would increase in speed with your engine speed.

Posted: Sun 9-Nov-2008 23:40 Post subject:

Since the only change is the connection of radio rebroadcast, is the radio on as well as the UTMD when the sound happens? If so, then the radio is picking up the RF hash from the slimlighters and it is heard on the speakers (Speaker wires from radio to utmd may be acting as an antenna). If you can, put a choke (ferrite bead) on the wires from the radio to the UTMD and see if that helps any. I had the same issue with my slimlighters and TIR3s in my truck until I put a choke on the speaker wires. Dan Slick Top Solutions

Posted: Mon 10-Nov-2008 00:21 Post subject:

well in the video you can see the radio is on (orange display) and the LEDs are on (back lit is on by ignition only but constant power to the UTMD). i always have the radio on so I have never tried it without the radio on. the RRB is always switched off even when the noise occurs. I will try tomorrow with the radio off. I am also still unaware of the device you were describing, ferrite bead. thanks for the help

Posted: Mon 10-Nov-2008 10:39 Post subject:

Check it with the radio off and we will go from there. Dan Slick Top Solutions

Posted: Mon 10-Nov-2008 14:09 Post subject:

still did it with radio off

Posted: Mon 10-Nov-2008 16:14 Post subject:

If it's not too much of a pain in the azz, disconnect the wiring from the radio to the UTMD at the radio side and see if it goes away.

Posted: Mon 10-Nov-2008 16:41 Post subject:

so disable radio rebroadcast? its a plug on the UTMD so i can just unplug it and try it? i'd like to keep the feature on cause i do use it when on some scenes. my main concern is it being a fire hazard, if it is one. it doesnt bother me that it makes the sound because it can only be heard when my ear is within inches of the speaker but i just want to make sure it isn't some crazy fire hazard. All my wiring is good and safe, fused, blah blah blah but still...kinda odd.

Posted: Mon 10-Nov-2008 23:13 Post subject:

Nope, not a fire hazard, just an annoyance. If you can live with it leave it. If it bothers you and you want to find it, unplug the rebroadcast from the UTMD and see if you still have it at your internal radio speaker. If so, the radio is picking up the rf hash from the lights. Dan Slick Top Solutions

Posted: Mon 10-Nov-2008 23:30 Post subject:

hrm. ok. ill check it out further. thanks for all the help

Posted: Wed 12-Nov-2008 03:43 Post subject:

Seems like you have a ground loop issue. Check to see if all the components in questions have the same power and ground points. Usually if there are two seperate ground sources, it would produce noises commonly called \"ground loops\". Give it a try & report. Sean

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